Ternary complex [Sm(acac)3(5-Br-2,2′-bpy)] for the solution-processed white polymer light-emitting diode (WPLED)

In consideration of the Sm3þ-centered characteristic orange-light as the ideal color-primary component toward a dichromatic white-light, herein, through the doping of the complex [Sm(acac)3(5-Br-2,20-bpy)] (2; Hacac ¼ acetylacetone; 5-Br-2,2′-bpy ¼ 5-Br-2,20-bipyridine) into the PVK (PVK ¼ poly(N-vinyl-carbazole)) host, the obtained PVK@2 film (10:1, wt/wt) exhibits the straightforward solid-state white-light (ΦPL ¼ 6.7%). Further using the PVK@2 film (10:1; wt/wt) as the emitting layer, its singlecomponent solution-processed WPLED gives the electroluminescent performance (LMax of 360.9 cd/m2, ηMax c of 1.08 cd/A) satisfactory enough for portable full-color flat displays

Single-component white polymer light-emitting diode (WPLED) based on a binary tris-pyrazolonate-Sm-complex

Based on the doping of the binary tris-pyrazolate-Sm3þ complex [Sm(tba-PMP)3(5-Br-2,20-bpy)] (1; 5-Br-2,2′bpy ¼ 5-bromo2,20-bipyridine and Htba-PMP ¼ 1-phenyl-3-methyl-4-(tert-butylacetyl)-5-pyrazolone)) with an efficient orange-light into the PVK (poly(N-vinylcarbazole) host, the obtained PVK@1 films exhibit the dichromatic color-tuning (white-light to purplish-pink and to pink) characters strictly relative to the Sm3þdoping content and the λex wavelength. Further using the PVK@1 film (10:1; wt/wt) with the straightforward white-light (ΦPL ¼ 5.8%) as the emitting layer, its single-component solution-processed WPLED gives the electroluminescent performance (LMax of 157 cd/m2, ηMax c of 0.65 cd/A and the white-light-emitting stability) satisfactory enough for portable full-color flat displays.

A printable thermally activated delayed fluorescence polymer light emitting diode

We report the first ink-jet printed thermally activated delayed fluorescence (TADF) polymer organic light emitting diode (OLED).